Fix downloader stopping after failing to create download directory of a manga (#2068)

(cherry picked from commit 536393a6d9941fac282f10b825aa611b91e1fcdb)

# Conflicts:
#	CHANGELOG.md
#	app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadManager.kt
#	app/src/main/java/eu/kanade/tachiyomi/data/download/Downloader.kt

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadManager.kt

@@ -316,11 +316,14 @@ class DownloadManager(
 
         if (removeNonFavorite && !manga.favorite) {
             val mangaFolder = provider.getMangaDir(/* SY --> */ manga.ogTitle /* SY <-- */, source)
+                .getOrNull()
+            if (mangaFolder != null) {
                 cleaned += 1 + mangaFolder.listFiles().orEmpty().size
                 mangaFolder.delete()
                 cache.removeManga(manga)
                 return cleaned
             }
+        }
 
         val filesWithNoChapter = provider.findUnmatchedChapterDirs(allChapters, manga, source)
         cleaned += filesWithNoChapter.size
@@ -336,8 +339,8 @@ class DownloadManager(
         }
 
         if (cache.getDownloadCount(manga) == 0) {
-            val mangaFolder = provider.getMangaDir(/* SY --> */ manga.ogTitle /* SY <-- */, source)
-            if (!mangaFolder.listFiles().isNullOrEmpty()) {
+            val mangaFolder = provider.getMangaDir(/* SY --> */ manga.ogTitle /* SY <-- */, source).getOrNull()
+            if (mangaFolder != null && !mangaFolder.listFiles().isNullOrEmpty()) {
                 mangaFolder.delete()
                 cache.removeManga(manga)
             } else {
@@ -405,7 +408,10 @@ class DownloadManager(
      */
     suspend fun renameChapter(source: Source, manga: Manga, oldChapter: Chapter, newChapter: Chapter) {
         val oldNames = provider.getValidChapterDirNames(oldChapter.name, oldChapter.scanlator)
-        val mangaDir = provider.getMangaDir(/* SY --> */ manga.ogTitle /* SY <-- */, source)
+        val mangaDir = provider.getMangaDir(/* SY --> */ manga.ogTitle /* SY <-- */, source).getOrElse { e ->
+            logcat(LogPriority.ERROR, e) { "Manga download folder doesn't exist. Skipping renaming after source sync" }
+            return
+        }
 
         // Assume there's only 1 version of the chapter name formats present
         val oldDownload = oldNames.asSequence()

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadProvider.kt

@@ -14,6 +14,7 @@ import tachiyomi.domain.storage.service.StorageManager
 import tachiyomi.i18n.MR
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
+import java.io.IOException
 
 /**
  * This class is used to provide the directories where the downloads should be saved.
@@ -35,20 +36,36 @@ class DownloadProvider(
      * @param mangaTitle the title of the manga to query.
      * @param source the source of the manga.
      */
-    internal fun getMangaDir(mangaTitle: String, source: Source): UniFile {
-        try {
-            return downloadsDir!!
-                .createDirectory(getSourceDirName(source))!!
-                .createDirectory(getMangaDirName(mangaTitle))!!
-        } catch (e: Throwable) {
-            logcat(LogPriority.ERROR, e) { "Invalid download directory" }
-            throw Exception(
-                context.stringResource(
-                    MR.strings.invalid_location,
-                    downloadsDir?.displayablePath ?: "",
-                ),
+    internal fun getMangaDir(mangaTitle: String, source: Source): Result<UniFile> {
+        val downloadsDir = downloadsDir
+        if (downloadsDir == null) {
+            logcat(LogPriority.ERROR) { "Failed to create download directory" }
+            return Result.failure(
+                IOException(context.stringResource(MR.strings.storage_failed_to_create_download_directory)),
             )
         }
+
+        val sourceDirName = getSourceDirName(source)
+        val sourceDir = downloadsDir.createDirectory(sourceDirName)
+        if (sourceDir == null) {
+            val displayablePath = downloadsDir.displayablePath + "/$sourceDirName"
+            logcat(LogPriority.ERROR) { "Failed to create source download directory: $displayablePath" }
+            return Result.failure(
+                IOException(context.stringResource(MR.strings.storage_failed_to_create_directory, displayablePath)),
+            )
+        }
+
+        val mangaDirName = getMangaDirName(mangaTitle)
+        val mangaDir = sourceDir.createDirectory(mangaDirName)
+        if (mangaDir == null) {
+            val displayablePath = sourceDir.displayablePath + "/$mangaDirName"
+            logcat(LogPriority.ERROR) { "Failed to create manga download directory: $displayablePath" }
+            return Result.failure(
+                IOException(context.stringResource(MR.strings.storage_failed_to_create_directory, displayablePath)),
+            )
+        }
+
+        return Result.success(mangaDir)
     }
 
     /**

app/src/main/java/eu/kanade/tachiyomi/data/download/Downloader.kt

@@ -327,7 +327,11 @@ class Downloader(
      * @param download the chapter to be downloaded.
      */
     private suspend fun downloadChapter(download: Download) {
-        val mangaDir = provider.getMangaDir(/* SY --> */ download.manga.ogTitle /* SY <-- */, download.source)
+        val mangaDir = provider.getMangaDir(/* SY --> */ download.manga.ogTitle /* SY <-- */, download.source).getOrElse { e ->
+            download.status = Download.State.ERROR
+            notifier.onError(e.message, download.chapter.name, download.manga.title, download.manga.id)
+            return
+        }
 
         val availSpace = DiskUtil.getAvailableStorageSpace(mangaDir)
         if (availSpace != -1L && availSpace < MIN_DISK_SPACE) {

i18n/src/commonMain/moko-resources/base/strings.xml

@@ -498,6 +498,8 @@
     <string name="pref_remove_exclude_categories">Excluded categories</string>
     <string name="no_location_set">No storage location set</string>
     <string name="invalid_location">Invalid location: %s</string>
+    <string name="storage_failed_to_create_download_directory">Failed to create download directory</string>
+    <string name="storage_failed_to_create_directory">Failed to create directory: %s</string>
     <string name="disabled">Disabled</string>
     <string name="last_read_chapter">Last read chapter</string>
     <string name="second_to_last">Second to last read chapter</string>